<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>Document</title>
    <style>
      div {
        width: 300px;
        height: 300px;
        border: 1px solid #000;
      }

      div::before {
        content: "我";
        display: inline-block;
        width: 100px;
        height: 100px;
        background-color: red;
      }

      div::after {
        content: "小猪佩奇";
        display: inline-block;
        width: 100px;
        height: 100px;
        background-color: red;
      }
    </style>
  </head>

  <body>
    <div>是</div>
  </body>
</html>
